Effect of loading rate on tension test values of aluminum alloys

Abstract

Tension tests were carried out using two testing machines, screw-gear type machine (Shimazu Autograph IS-10T) and oil-hydraulic type machine (Shimazu Universal Testing Machine RH10). The proof stress is unsusceptible to the loading rate measured by the use of a screw-gear type machine, but is lowered with the accelerated loading rate by the use of a hydraulic machine because of the time lag for load indication. The tensile strength and elongation of soft materials such as 1050-H14 and 1230-H18 slightly increase with the accelerated loading rate. The tensile strength of such alloys as 2024-T3, 5052-H34 and 5083-O that show serrations decreases with the accelerated loading rate. The strain rate should be in the range from 20 to 80%/min for tension test of aluminum alloys.